EP3309883B1 - Festoxid-brennstoffzelle - Google Patents

Festoxid-brennstoffzelle Download PDF

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Publication number
EP3309883B1
EP3309883B1 EP15894908.1A EP15894908A EP3309883B1 EP 3309883 B1 EP3309883 B1 EP 3309883B1 EP 15894908 A EP15894908 A EP 15894908A EP 3309883 B1 EP3309883 B1 EP 3309883B1
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EP
European Patent Office
Prior art keywords
metal support
area
power generating
fuel cell
buffer area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15894908.1A
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English (en)
French (fr)
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EP3309883A4 (de
EP3309883A1 (de
Inventor
Keita Iritsuki
Takao Izumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
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Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP3309883A1 publication Critical patent/EP3309883A1/de
Publication of EP3309883A4 publication Critical patent/EP3309883A4/de
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Publication of EP3309883B1 publication Critical patent/EP3309883B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
    • H01M8/1226—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material characterised by the supporting layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0232—Metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H01M8/2425—High-temperature cells with solid electrolytes
    • H01M8/2432—Grouping of unit cells of planar configuration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M2008/1293—Fuel cells with solid oxide electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0065—Solid electrolytes
    • H01M2300/0068—Solid electrolytes inorganic
    • H01M2300/0071—Oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to a solid oxide fuel cell.
  • a fuel cell is a device which converts chemical energy to electrical energy through an electrochemical reaction (see, for example, Japanese Patent Application Publication No. Hei. 10-199555 ).
  • a solid oxide fuel cell which is a class of such fuel cell, includes layers of a fuel electrode, an electrolyte, and an air electrode stacked together to serve as a power generation unit of the fuel cell, and is configured to supply the fuel electrode with a fuel gas such as hydrogen or hydrocarbon from the outside and to supply the air electrode with an oxidant gas such as air, thereby generating electricity.
  • a power generation cell being a power generation unit of a fuel cell is sandwiched by a pair of separators from both sides.
  • a fuel flow path or an air flow path is defined between the power generation cell and the corresponding one of the separators.
  • US 2012/205042 A1 discloses a unit for use in a fuel cell stack, the unit comprising a porous metal support with a seal made by local fusion and-having a seal depth that extends from the upper surface of the porous metal support to at least the bottom surface of the porous metal support, and wherein the seal is positioned along the periphery of the porous metal support, the seal being impermeable to gas transported in the plane of the porous metal support.
  • US 2006/251947 A1 discloses a bipolar plate supported solid oxide fuel cell with a sealed anode compartment is provided.
  • the solid oxide fuel cell includes a cathode, an electrolyte, and an anode, which are supported on a metallic bipolar plate assembly including gas flow fields and the gas impermeable bipolar plate.
  • the electrolyte and anode are sealed into an anode compartment with a metal perimeter seal.
  • An improved method of sealing is provided by extending the metal seal around the entire perimeter of the cell between an electrolyte and the bipolar plate to form the anode compartment.
  • the metal seal bonds to the edges of the electrolyte and anode layers, the metal foam flow field and the bipolar plate to form a gastight containment.
  • US 2005/221153 A1 discloses a gas permeable substrate comprising a porous metallic plate having a plurality of pores which form openings in an uppers surface and/or a lower surface thereof, and particles filled in the pores.
  • a gas permeable substrate comprising a porous metallic plate having a plurality of pores which form openings in an uppers surface and/or a lower surface thereof, and particles filled in the pores.
  • the gas permeable substrate at least one of the upper surface and the lower surface of the porous metallic plate is substantially smooth.
  • the present invention aims to provide a solid oxide fuel cell which can suppress generation of an excessively large thermal stress at rapid startup and suppress breakage of the power generation cell.
  • a metal support includes a buffer area which is formed on an outer side of a power generating area in an in-plane direction.
  • a pore in the metal support in the buffer area is filled with a material with a thermal conductivity lower than that of a formation material of the metal support.
  • a thermal conductivity of a buffer area of a metal support is lower than a thermal conductivity of a power generating area, it is possible to make small a temperature gradient of an end portion of the power generating area of the metal support because at rapid startup heat does not easily conduct from the power generating area to an outer side. This decreases a temperature difference at an end portion of a power generation cell facing the power generating area, reducing a thermal stress to be generated in the end portion of the power generation cell. Thus, it is possible to suppress generation of an excessively large thermal stress at rapid startup and to suppress breakage of the power generation cell.
  • a solid oxide fuel cell according to a first embodiment of the present invention is described based on Fig. 1 to Fig. 4 .
  • the solid oxide fuel cell is a class of a fuel cell which is a device configured to convert chemical energy to electrical energy through an electrochemical reaction. As illustrated in Fig. 1 and Fig. 2 , the solid oxide fuel cell according to the embodiment includes a plate-shaped metal support 1, and a pair of separators 2, 2 which sandwich both sides of this metal support 1.
  • the metal support 1 and the separators 2 stacked together are sandwiched on both sides (both end sides in a stacking direction) by a pair of seal frames 3. These seal frames 3 sandwich and support an outer edge portion (outer peripheral area OA) of the metal support 1. Also, the seal frames 3 sandwich and support outer edge portions of the separators 2.
  • the metal support 1 and the corresponding seal frame 3 are fixed together with an insulation layer 5 made of e.g. an adhesive with a seal material 4 provided in between.
  • the metal support 1 and the corresponding separator 2, and the separator 2 and the seal frame 3 are fixed together by welding.
  • a welded portion 6 of the metal support 1 and the separator 2 and a welded portion 7 of the separator 2 and the seal frame 3 are indicated with a triangle.
  • a power generation cell 8 is disposed on one of the surfaces of the metal support 1.
  • This power generation cell 8 is formed as a stacked body of a fuel electrode (anode electrode) 9, a solid oxide electrolyte 10, and an air electrode (cathode electrode) 11.
  • the fuel electrode 9 and the air electrode 11 are disposed with the electrolyte 10 in between.
  • the power generation cell 8 is stacked such that the fuel electrode 9 is in contact with the metal support 1.
  • a current collection assist layer 12 is stacked on the air electrode 11 of the power generation cell 8. In such a manner, the metal support 1 supports the power generation cell 8.
  • Each of the separators 2 is formed such that a portion thereof corresponding to the active area of the power generation cell 8 which contributes to power generation has the shape of a wave and that a contact portion 2a in contact with the metal support 1 and a contact portion 2b in contact with the current collection assist layer 12 are arranged alternately.
  • a fuel gas and an oxidant gas are made to flow in a space defined by the portion of the separator 2 which has the wavy shape and by the metal support 1, and a space defined by the portion of the separator 2 which has the wavy shape and by the current collection assist layer 12, respectively.
  • the separator 2 has a function of defining a fuel flow path 13 or an air flow path 14 between the power generation cell 8 and the corresponding one of the metal support 1 and the current collection assist layer 12. In addition, the separator 2 also has a function of collecting electricity generated by the power generation cell 8.
  • the separator 2 is fixed to the metal support 1 by welding the contact portion 2a of the separator 2 in contact with the metal support 1, and the separator 2 is fixed to the current collection assist layer 12 by welding the contact portion 2b of the separator 2 in contact with the current collection assist layer 12.
  • a welded portion 15 between the separator 2 and the metal support 1 and a welded portion 16 between the separator 2 and the current collection assist layer 12 are indicated with a triangle.
  • the above-described metal support 1 is formed of a conductive material for the purpose of improving an output of the fuel cell per unit area. Also, gas permeability is required for the metal support 1 in order to supply the electrodes with a fuel gas or an oxidant gas.
  • the metal support 1 is formed from, for example, a porous metal substrate which is made by sintering metal particles. Formed on both sides of the power generation cell 8 on this metal support 1 are: manifold parts M, M for supplying and discharging a fuel gas or an air gas; and diffuser portions D each of which is an area for allowing a fuel gas or an oxidant gas to flow from the manifold parts M, M to the power generation cell 8. In addition, the diffuser portions D are provided with a spacer 17 and protrusions 18.
  • the metal support 1 includes a power generating area GA in which the power generation cell 8 is disposed, a non-power-generating buffer area BA which is formed in an area on the outer side of the power generating area GA in an in-plane direction and which is not provided with the power generation cell 8, and an outer peripheral area OA which is formed in an area further on the outer side of the buffer area BA.
  • This metal support 1 is configured such that the thicknesses of the power generating area GA and the buffer area BA are smaller than the thickness of the outer peripheral area OA.
  • the metal support 1 is configured such that the thickness of the outer peripheral area OA is larger than the thicknesses of the power generating area GA and the buffer area BA.
  • the areas of the buffer area BA are hatched.
  • the outer peripheral area OA of the metal support 1 is a portion sandwiched by the seal frames 3 on both sides and is a dense layer which does not allow permeation of gas in a thickness direction.
  • the power generating area GA of the metal support 1 is a porous layer which allows permeation of gas in the thickness direction.
  • the outer peripheral area OA may be densified by pressing or may be densified by sintering metal particles with a relatively large particle diameter.
  • the buffer area BA of the metal support 1 is originally a porous layer, but unlike the power generating area GA, the pores in the metal support 1 in the buffer area BA are filled with a filler material which has a thermal conductivity lower than that of the formation material of the metal support 1.
  • the thermal conductivity of the buffer area BA is made lower than the thermal conductivity of the power generating area GA, and the thermal capacity of the buffer area BA is made larger than the thermal capacity of the power generating area GA.
  • the thermal conductivity of the buffer area BA is made lower than the thermal conductivity of the outer peripheral area OA, and the thermal capacity of the buffer area BA is made larger than the thermal capacity of the outer peripheral area OA by adjusting e.g. the thermal conductivity of the formation material of the metal support 1 and the thermal conductivity of the filler material.
  • Ceramic materials such as yttria-stabilized zirconia (YSZ), lanthanum strontium magnesium gallate (LSGM), samarium-doped ceria (SDC), gadolinium-doped ceria (GDC), and scandium-stabilized zirconia (SSZ) can be used as the above-described filler material.
  • YSZ yttria-stabilized zirconia
  • LSGM lanthanum strontium magnesium gallate
  • SDC samarium-doped ceria
  • GDC gadolinium-doped ceria
  • SSZ scandium-stabilized zirconia
  • the pores in the metal support 1 in the buffer area BA are filled by, for example, impregnating the pores in the metal support 1 with a pasty filler material and then heating and hardening the filler material.
  • the buffer area BA of the metal support 1 is formed into a dense layer which does not allow permeation of gas in the thickness direction.
  • an edge seal structure is formed in the electrolyte 10 of the power generation cell 8 by extending an end portion of the electrolyte 10 into the buffer area BA.
  • a flow path space 19 may be formed in a space next to the buffer area BA of the metal support 1.
  • the flow configuration may be such that a gas is allowed to flow in this flow path space 19, the gas having the same temperature as the gas made to flow in the flow path space next to the power generating area GA (to be more specific, the fuel flow path 13 or the air flow path 14).
  • Such a solid oxide fuel cell is configured to supply the fuel electrode 9 (fuel flow path 13) with a fuel gas such as hydrogen or hydrocarbon, and on the other hand to supply the air electrode 11 (air flow path 14) with an oxidant gas such as air or oxygen, thereby generating electricity.
  • a stacked body in which the metal supports 1 and the separators 2 described above are stacked in multiple layers is the solid oxide fuel cell with a stack structure.
  • the temperature distribution simulation for the metal support was conducted by use of a computer based on various types of data such as the shape of the metal support, physical property values of the formation material, the temperature of high-temperature gas flowing in the fuel cell, and the temperature outside the fuel cell.
  • the temperature distribution of the metal support 70 seconds after the rapid startup was simulated under the rapid startup condition (heating condition) of 10.78 °C/s.
  • Example 2 In the simulation of Example 1, a high-temperature gas was not made to flow in the flow path space next to the buffer area, and in the simulation of Example 2, high-temperature gas was made to flow in the flow path space next to the buffer area.
  • Example 1 the highest temperature Tmax of the metal support was 900°C, and the maximum temperature difference Max ⁇ t was 690°C.
  • Example 1 shows that the temperature gradient in the power generating area is smaller compared to the case where the buffer area is not provided, and the temperature difference ⁇ t at the end portion of the power generation cell is smaller compared to the case where the buffer area is not provided.
  • Example 2 shows that the temperature gradient in the power generating area is zero and the temperature difference ⁇ t at the end portion of the power generation cell is zero.
  • the temperature of the flow path space 19 next to the buffer area BA and the temperature of the flow path space next to the power generating area GA are the same, the temperature of the end portion of the power generating area GA and the temperature of the central portion thereof are the same. This even decreases the temperature difference ⁇ t at the end portion of the power generation cell 8 facing the power generating area GA, further reducing the thermal stress to be generated in the end portion of the power generation cell 8.
  • a solid oxide fuel cell according to a second embodiment of the present invention is described based on Fig. 5 . Note that the constituents identical to those of the first embodiment described above are given the same reference signs, and the explanation for those constituents is omitted.
  • the solid oxide fuel cell according to the second embodiment is configured such that the pore diameter of the metal support 1 in a boundary neighborhood portion 20 of the buffer area BA adjacent to the power generating area GA is smaller than the pore diameter of the metal support 1 in the power generating area GA.
  • the edge seal structure is formed in the electrolyte 10 of the power generation cell 8 by extending the end portion of the electrolyte 10 to the above-described boundary neighborhood portion 20.
  • the pore diameter of the metal support 1 in the boundary neighborhood portion 20 of the buffer area BA adjacent to the power generating area GA is smaller than the pore diameter of the metal support 1 in the power generating area GA.
  • Such a configuration makes it possible to prevent the filler material filling the pores in the metal support 1 in the buffer area BA from flowing into the pores in the metal support 1 in the power generating area GA because the density in the boundary neighborhood portion 20 is high after sintering.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Claims (3)

  1. Festoxid-Brennstoffzelle, die umfasst:
    einen Träger (1) aus Metall, der aus einem porösen Metallsubstrat besteht und der eine Stromerzeugungs-Zelle (8) trägt, wobei
    der Träger (1) aus Metall einen Stromerzeugungs-Bereich (GA), in dem die Stromerzeugungs-Zelle (8) angeordnet ist, und einen Puffer-Bereich (BA) enthält, der an einer Außenseite des Stromerzeugungs-Bereiches (GA) in einer Ebenen-Richtung ausgebildet ist,
    Poren in dem Träger (1) aus Metall in dem Puffer-Bereich (BA) mit einem Material mit einer Wärmeleitfähigkeit gefüllt sind, die niedriger ist als die eines Materials zum Ausbilden des Trägers (1) aus Metall, und
    der Träger (1) aus Metall in dem Puffer-Bereich (BA) in einer dichten Schicht ausgebildet ist, die keine Permeation von Gas in einer Dickenrichtung zulässt.
  2. Festoxid-Brennstoffzelle nach Anspruch 1, wobei
    ein Strömungsweg-Raum (19) neben dem Puffer-Bereich (BA) vorhanden ist, durch den ein Gas hindurchgeleitet werden kann, und
    ein Strömungsweg-Raum (13, 14) neben dem Stromerzeugungs-Bereich (GA) vorhanden ist, durch den ein Gas hindurchgeleitet werden kann.
  3. Festoxid-Brennstoffzelle nach Anspruch 1 oder 2, wobei
    ein Porendurchmesser des Trägers (1) aus Metall in einem Grenz-Nachbarschaftsabschnitt (20) des Puffer-Bereiches (BA), der an den Stromerzeugungs-Bereich (GA) angrenzt, kleiner ist als ein Porendurchmesser des Trägers (1) aus Metall in dem Stromerzeugungs-Bereich (GA).
EP15894908.1A 2015-06-09 2015-06-09 Festoxid-brennstoffzelle Active EP3309883B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/066611 WO2016199223A1 (ja) 2015-06-09 2015-06-09 固体酸化物型燃料電池

Publications (3)

Publication Number Publication Date
EP3309883A1 EP3309883A1 (de) 2018-04-18
EP3309883A4 EP3309883A4 (de) 2018-07-25
EP3309883B1 true EP3309883B1 (de) 2020-09-30

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EP15894908.1A Active EP3309883B1 (de) 2015-06-09 2015-06-09 Festoxid-brennstoffzelle

Country Status (7)

Country Link
US (1) US10483579B2 (de)
EP (1) EP3309883B1 (de)
JP (1) JP6521064B2 (de)
CN (1) CN107615540B (de)
BR (1) BR112017026684B1 (de)
CA (1) CA2988369C (de)
WO (1) WO2016199223A1 (de)

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JP6888690B2 (ja) * 2017-11-29 2021-06-16 日産自動車株式会社 燃料電池スタック
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JP7655383B2 (ja) * 2021-06-08 2025-04-02 日産自動車株式会社 固体酸化物形燃料電池および固体酸化物形燃料電池の製造方法
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Also Published As

Publication number Publication date
CN107615540A (zh) 2018-01-19
US10483579B2 (en) 2019-11-19
CN107615540B (zh) 2018-10-02
US20180175424A1 (en) 2018-06-21
WO2016199223A1 (ja) 2016-12-15
BR112017026684A2 (pt) 2018-08-14
EP3309883A4 (de) 2018-07-25
CA2988369C (en) 2019-07-16
JPWO2016199223A1 (ja) 2018-04-12
EP3309883A1 (de) 2018-04-18
BR112017026684B1 (pt) 2022-07-26
JP6521064B2 (ja) 2019-05-29
CA2988369A1 (en) 2016-12-15

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